Scribd (scribd.com) claims to be the world's largest digital library with over 80 million users. The service features a subscription available for a monthly fee of $8.99 that allows readers unlimited access to more than 400,000 books from over 900 publishers, including Harper Collins, RosettaBooks, and Workman as well as New York Times bestsellers and literary classics.

Scribd also is the world's largest digital document collection, with millions of user-uploaded documents and written works. While the app has been available for iOS and Android for long, the official Scribd app has finally arrived for the Windows platform – as a Universal app for both Windows Phone and Windows 8.

The app features editorial collections and offers personalized recommendations that help with the discovery. Available worldwide, the subscription offers unlimited usage across all your devices on different platforms, including the Web browser. All your books are synced automatically across devices. You can pin your favorite books or the ones that you are currently reading to your Start screen for quick access.

While the app has a neat bookshelf-like design to emulate a library, and an intuitive user experience, there's one challenge. You must be connected to Wi-Fi or have an active data connection to read books. An offline functionality would've been great especially since a lot of reading happens on long flights.

Download the Scribd app for Windows Phone 8 devices from the Windows Phone Store and for your Windows 8 devices from the Windows Store. Scribd is like a Netflix for book lovers, and similar to the real-world library memberships. Check out the app, and the service if you haven't heard of it, and let us know how you like it.